CN201188259Y

CN201188259Y - Combustible gas induction module

Info

Publication number: CN201188259Y
Application number: CNU2008200925939U
Authority: CN
Inventors: 武光杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-19
Filing date: 2008-03-19
Publication date: 2009-01-28
Anticipated expiration: 2018-03-19

Abstract

The utility model provides a circuit module utilizing a flammable gas sensor to detect the flammable gas concentration in the air environment. When the flammable gas concentration in the air environment exceeds the set warning concentration of a sensing module, the module outputs a high level alarm control signal, an LED twinkles and a buzzer gives out sound. The flammable gas sensing module element comprises a flammable gas sensor, the buzzer, the LED, a signal processing single-chip, a power supply input port, a signal input port, a power supply voltage regulator, a circuit board positioning screw hole, and so on. The DC power with 6 to 20 volts is used. The circuit module is characterized in that the detecting flexibility is high, the power consumption is low, the voltage range is wide, and the use is simple, thereby being applied to sensing control fields such as the coal mine gas monitor, the industrial methane monitor, the natural gas monitor, the security monitor for automobile taking natural gas as the power fuel, the civil use gas leakage alarm, and the like.

Description

Combustible gas sensing module

Technical field

The utility model relates to the combustible gas sensor application technology, relates in particular to combustible gas sensing module.

Background technology

At present, combustible gas sensor is mainly used in coal-mine gas monitoring, industrial methane, rock gas monitoring, be that the inductions such as automotive safety monitoring, domestic gas leakage alarm of power fuel are controlled on the product with the rock gas, be used for detecting combustable gas concentration in the air ambient, need the special circuit of design to use, at present less with the product of combustible gas sensor modular structure.For being used, oversimplifies combustible gas sensor, the utility model provides a kind of combustible gas sensing module, this module is with combustible gas sensor, and alarm buzzer is indicated light emitting diode, signal comparator, signal processing single chip, power regulator etc. are integrated on the circuit board of a 38*26mm, use the work of 6-20V direct supply, use simply, combustible gas sensor is more widely used.

Summary of the invention

The utility model purpose provides a kind of combustible gas sensing module, be used for detecting combustable gas concentration in the air ambient, when combustable gas concentration in the air ambient exceeds the warning concentration of setting of induction module, module output alarm control signal, light emitting diode lamp flicker simultaneously, hummer sends sound.The warning high-level control signal of output can directly drive load, in time eliminates safe hidden trouble, and also can be used for other above product through developing once more.

To achieve the above object of the invention, the utility model proposes following technical scheme:

A kind of combustible gas sensing module is characterized in that: components and parts are provided with above the circuit board of this module (Fig. 3): combustible gas sensor TP-1.1, alarm hummer, report to the police and indicate light emitting diode, power regulator HT7350, signal processing single chip, signal comparator etc.

The DC voltage of 6-20V produces the voltage of 5V for combustible gas sensing module work through power regulator.Combustible gas sensor .TP-1.1 is under Single-chip Controlling, detect combustable gas concentration in the air ambient, the signal of sensor output, the voltage comparator of forming by LM393 inputs to single-chip microcomputer, single-chip microcomputer is by gathering the signal level of voltage comparator input, analyze whether combustable gas concentration exceeds the warning concentration of the setting of induction module in the air ambient, also detect the duty of combustible gas sensor, and finish the desorption that powers on of combustible gas sensor by voltage comparator.When combustable gas concentration in the air ambient exceeds the warning concentration of induction module setting, module output high level alarm control signal, light emitting diode lamp flicker simultaneously, hummer sends sound.

Design feature of the present invention:

1 is low in energy consumption, module quiescent dissipation 10mA.

2 voltage ranges are wide, use direct current 6-20V.

3 use simple, power supply+, power supply-and signal output, three lead-in wires.

The utility model can be widely used in coal-mine gas monitoring, industrial methane, rock gas monitoring, be that the control field is responded in the automotive safety monitoring, domestic gas leakage alarm etc. of power fuel with the rock gas.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the fundamental block diagram of the utility model combustible gas sensing module.

Fig. 2 is the electrical schematic diagram of the utility model combustible gas sensing module.

Fig. 3 is the contour structures and the components and parts location drawing of the utility model combustible gas sensing module circuit board.

Fig. 4 is that the signal of the utility model combustible gas sensing module uses figure.

Fig. 5 is that the DC load of the utility model combustible gas sensing module is used figure.

Fig. 6 is that the AC load of the utility model combustible gas sensing module is used figure.

Fig. 3 is the contour structures and the explanation of the components and parts location drawing of the utility model combustible gas sensing module circuit board:

Among the figure: circuit board physical dimension 38*26mm (1), hummer (2), set screw hole 3mm (3), light emitting diode (4), power supply is connected location staight needle (5), power regulator HT7350 (6), signal processing single chip (7) with signal, combustible gas sensor TP-1.1 (8), signal comparator (9).

Embodiment

After being input to the direct supply process HT7350 voltage regulation filtering of combustible gas sensing module 6-20V, the voltage that produces 5V is for whole modular circuit work.

1 single-chip microcomputer work is implemented:

The 13 pin oscillatory circuits of single-chip microcomputer 48R05A are made up of C1 and R1, and reset circuit is made up of the R2 and the C3 of 11 pin.The induced signal of combustible gas sensor TP-1.1 is input to 1 and 3 pin of single-chip microcomputer through the voltage comparator that LM393A/B forms.The desorption control signal that powers on outputs to the base stage of Q2 by 18 pin of single-chip microcomputer, and Q2 is the sensor desorption control triode that powers on.The controlling alarm high level signal is exported by 7 pin.The alarm buzzer control signal is input to the base stage of Q1 by 6 pin, and Q1 is that hummer drives triode.4 and 5 pin sending and receiving optical diodes are finished the indication of reporting to the police, the desorption that powers on indication and sensor failure indication.

Power on desorption, hummer and light emitting diode indication of 2 combustible gas sensor TP-1.1 implemented:

Desorption powers on: connect the 6-20V direct supply, hummer rings once, after red light emitting diodes dodges once, the output level of single-chip microcomputer detection comparator, judge whether combustible gas sensor is normal, the inefficacy if the inductor of sensor opens circuit, yellow light-emitting diode is with 0.5 time/second frequency scintillation, hummer sends mild sound simultaneously, and the prompting combustible gas sensor lost efficacy.If combustible gas sensor is normal, begin the desorption that powers on, green LED is with each/1 second frequency scintillation, and each desorption time is 60 seconds, and a process is 8 times.Single-chip microcomputer 18 pin output high level, control Q2 conducting increases the sensor conducts electric current, shorten the sensor desorption time that powers on, after 60 seconds, single-chip microcomputer 18 pin output low levels, control Q2 ends, green LED stops flicker, delay time after 3 seconds, whether the detecting sensor desorption success, as normally, the desorption that powers on finishes, and enters normal operating conditions.Unsuccessful as desorption, the above process that circulates is carried out the next round desorption that powers on.If process 8 times, sensor do not have the desorption success, hummer sends sound, and red light emitting diodes is with 1 time/second frequency scintillation, and the prompting sensor desorption that powers on is unsuccessful, needs outage again, powers up desorption again, up to normal operation of sensor.Sensor powers on the concrete time that desorption needs, be according to sensor under off position, be in resting period length in the air and discuss, time is long more, desorption time can prolong, but generally all can finish in a process (i.e. in 480 seconds), indivedual obstinate sensors need plural process.Its reason is that combustible gas sensor is not when working, sensor surface can adsorb some airborne gas molecule materials, cause sensor that the inflammable gas reaction sensitivity is reduced, need the process of the desorption that powers on when therefore using, guarantee the work of sensor normal reliable.

3 combustible gas sensor TP-1.1 warnings, hummer and light emitting diode indication are implemented:

After the sensor desorption success of combustible gas sensing module, enter normal operating conditions, when combustable gas concentration in the air ambient exceeded the warning concentration of module settings, LM393B output level signal from high to low triggered single-chip microcomputer and reports to the police.Single-chip microcomputer 6 pin output signals, control Q1 drives hummer and sends rapid sound, and 4 pin output signals make red light emitting diodes with 1.5 times/second frequency scintillations, and 7 pin output alarm high-level control signal are for external use.During the warning, single-chip microcomputer incessantly detects the level signal of LM393B output, only. have when combustable gas concentration in the air ambient is lower than the warning concentration of module settings, LM393B output level signal from low to high after single-chip microcomputer collects this signal, determines that combustable gas concentration recovers normal value in the air ambient, single-chip microcomputer was delayed time after 30 seconds, stop alerting signal output, single-

chip microcomputer

6,4,7 pin output low levels, combustible gas sensing module returns to normal detected state.

As can be seen from the above technical solutions, the utility model is with combustible gas sensor, the alarm hummer, report to the police and indicate light emitting diode, power regulator HT7350, signal processing single chip, electronic devices and components such as signal comparator are integrated on the circuit board of a 38*26mm, form combustible gas sensing module.By signal processing single chip, finish the combustible gas sensor desorption that powers on automatically, the desorption acousto-optic that powers on indication, sensor failure indication, and function such as the indication of reporting to the police automatically.The about 10mA of module dissipation, use the 6-20V direct supply, the output induced signal can be used as level signal and uses or directly drive load, use simply, can be widely used in coal-mine gas monitoring, industrial methane, rock gas monitoring, be that the control field is responded in the automotive safety monitoring, domestic gas leakage alarm etc. of power fuel with the rock gas.

Claims

1, a kind of combustible gas sensing module is characterized in that:

The circuit board top components and parts of this module are provided with: circuit board physical dimension 38mm*26mm (1), hummer (2), set screw hole 3mm (3), light emitting diode (4), power supply is connected location staight needle (5), power regulator HT7350 (6), signal processing single chip (7) with signal, combustible gas sensor TP-1.1 (8), signal comparator (9); The direct supply of 6-20V is through voltage stabilizer HT7350 (6), and the DC voltage that produces 5V is for module work; Two voltage comparators that the induced signal of combustible gas sensor TP-1.1 (8) is formed through LM393, be input to signal processing single chip (7), when airborne combustable gas concentration exceeds the warning concentration of module settings, single-chip microcomputer output high-level control signal, and driving hummer (2) sends sound, the indication of driven for emitting lights diode (4) flicker simultaneously; Signal processing single chip (7) begins also to want the performance of detecting sensor powering on, and the desorption that powers on of combustible gas sensor TP-1.1 (8) is finished in the back control Q2 conducting that meets the demands; By the pulsed frequency of change hummer (2) and the fluorescent lifetime of light emitting diode (4), desorption is indicated, the warning luminotron is indicated, sensor failure is indicated, the alarm buzzer deixis to provide sensor to power on, and the warning high-level control signal is by the 7 pin output of signal processing single chip (7).

2, combustible gas sensing module according to claim 1 is characterized in that:

Use the rectangle double-sided PCB, physical dimension 38mm*26mm; Hummer (2) is arranged on the circuit board, and combustible gas sensor TP-1.1 (8) is in the positive center of wiring board level, and is in the center symmetric position; 2 set screw hole 3mm (3), the positive center of the level that is in marginal position; Report to the police and indicate light emitting diode (4), be in side on the lower side, the positive center of wiring board level; Power supply is connected location staight needle (5) with signal, be in side on the lower side, the positive center of wiring board level; Power regulator HT7350 (6) is in the wiring board lower left corner; Signal processing single chip (7) is in center edge position above the wiring board; Signal comparator (9) is in the wiring board inferior horn of taking back.